Post a New Question

Statistics - Correlation Coefficient/Regression

15,962 results

Statistics
Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...

Statistics
Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...

Statistics
X Y 0 23 2 27 2.3 29 4.1 32 5 35 What is the correlation for this data set? 10) Find the regression line for this data set.

statistics
Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is 0.876 and the regression line is y-hat = 11,76 + 0.89x, where x represents the IQ score of the twin born second. Also,the 20x values have a mean of ...

Statistics
In conducting multiple regression analyses (MRAs), a major technical concern involves any high correlation of predictor (regressor) variables included in the model. The term for this is ....? A. Redundant predictors B. Close "knit" IVs C. Multicollinearity D. Correlative ...

Stats
The linear correlation coefficient is a numerical value that ranges from -1.00 to +1.00. Describe in a sentence or two the meaning of each of these correlation coefficients: a) -1.00 b) +1.00

statistics
For problems 12 to 14, do the following: (a) Make a scatter diagram of the scores; (b) describe in words the general pattern of correlation, if any; (c) figure the correlation coefficient; (d) figure whether the correlation is statistically significant (use the .05 ...

statistics
For problems 12 to 14, do the following: (a) Make a scatter diagram of the scores; (b) describe in words the general pattern of correlation, if any; (c) figure the correlation coefficient; (d) figure whether the correlation is statistically significant (use the .05 ...

Statistics
The linear correlation coefficient, r, is a numerical measure of the strength of the relationship between two variables representing quantitative data.

statistics
How to (1)Comment on the R-squared. (2). Conduct the test of significance for the regression equation in part 1. Interpret your finding. (3). Interpret the correlation coefficient. (4). Test the significance of the strength of relationship. ( use á =.10) Data School-Enroll-...

Statistics
Using a sample of recent university graduates, you estimate a simple linear regression using initial annual salary as the dependent variable and the graduate's weighted average mark (WAM) as the explanatory variable. If the regression model has an estimated intercept of 2200 ...

Statistics Help Please
A sample of eight observations of variables x and y is shown below: x 5 3 7 9 2 4 6 8 y 20 23 15 11 27 21 17 14 Find the value of coefficient of correlation, r. a) - 0.991 b)0.872 c)- 0.512 d)0.942

Statistics
Determine the regression line of x+2y-5=0 and 3x+3y-8=0 (i) y on x and (ii) x on y, (iii) Find r using the regression coefficients

math gre ques
A sudent is analyzing data from an experiment using a linear model. when the student entered the data into his calculator and ran a least squares linear regression the calculator gave a correlation coefficient of 0.01. what can the student infer from this coefficient? a. the ...

Statistics
For the regression equation, Y=bX+a, which of the following X,Y points will be on the regression line? a, a,b b, b,a c, 0,a d, 0,b

Statistics
True or false? The linear correlation coefficient, r, is a numerical measure of the strength of the relationship between two variables representing quantitative data.

Stats
Can someone please show me how to solve this step by step. I'm trying to understand the whole concept but I'm getting confused... Find the sample linear correlation coefficient between x and y: x: 5, 2, 2 y: 7, 4, 7 x^2: 25, 4, 4 y^2: 49, 16, 49 xy: 35, 18, 14 I know how to ...

statistics
5. The ages of husbands and wives in a community were found to have a correlation coefficient equal to +0.8; the average of husbands’ ages was 25 years and that of wives’ ages 22 years; their standard deviations were respectively 4 and 5 years. Find the two lines of ...

statistics
5. The ages of husbands and wives in a community were found to have a correlation coefficient equal to +0.8; the average of husbands’ ages was 25 years and that of wives’ ages 22 years; their standard deviations were respectively 4 and 5 years. Find the two lines of ...

Statistics
Is is possible for the regression equation to have none of the actual (observed) data points located on the regression line?

math
if the relation between x and u is 3x + 4u + 7 = 0 and the correlation coefficient between x and y is -0.6, then what is correlation coefficient u and y

stats
if the relation between x and u is 3x + 4u + 7 = 0 and the correlation coefficient between x and y is -0.6, then what is correlation coefficient u and y a)-0.6 b)0.8 c)0.6 d)-0.8

Statistics
The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...

Advanced Functions
Nadia collected the data in the table on the left using a CBR after a ball was dropped. (a) Enter the data into L1 and L2 using a TI-83 Plus. Graph the relation. (b) Without looking at the graph, how do you know that the relation is not linear? (c) Use regression to find the ...

Math
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.

Stats
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.

PLZ HELP....STATS
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.

Statistics
For the following set of scores: X Y 6 4 3 1 5 0 6 7 4 2 6 4 a) Compute the Pearson correlation. b) Add 2 points to each X value and compute the correlation for the modified scores. How does adding a constant to every score affect the value of the correlation? c)Multiply each ...

STATS
X 3, 5, 6, 8, 9, 10, 12, 14, 15 Y 30,33,34,36,37,40, 50, 60, 70 Calculate Linear Correlation Coefficient r Use significance level 0.05 and Appendix Table A-6 to make decision about linear correlation between x and y.

statistics
The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. (a)One of the petals is 0.2 cm wider ...

STATISTICS
True or False? A researcher is interested in studying whether there is a correlation of IQ with health. For this purpose he selected a sample of 261 people and asked them to complete two questionnaires: one for IQ and one for health. After evaluating the questionnaires each ...

Business Statistics
If the total variation in y values is 200, and the variation explained by regression line is 180, then the coefficient of determination is equal to __________. A) 1.11 B) 0.90 C) 0.81 D) 1.21 I picked D 1.21

Stats
Construct a scatterplot for the (x, y) values below, and answer the following questions. You do NOT need to submit your scatterplot with your answer; however, show all other work. x y 1 2.5 2 5.0 3 7.5 4 10.0 5 12.5 - What would be the slope of this regression line? - Would ...

statistics
a training manager wants to know if there is a link between the hours spent by particular category of employeee in training and their productivity on the job. a ssmple of 10 employee files was randomly selected and the following data extracted: employee productivity hrs in ...

Statistics
How would you interpret the findings of a correlation study that reported a linear correlation of +0.3? I believe they have nothing in common because they are close to one. Please advise

Econ/stats
The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line indicates. b. Compute ...

Econ/stats
The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line indicates. b. Compute ...

Math
Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37 minutes; and 24.9...

algebra 1
Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37 minutes; and 24.9...

math help pls pls pls
The table below shows the age of some participants in a quiz competition and the number of questions they could answer correctly: Age (years) (x) 15 21 17 22 16 19 18 Number of questions they could answer (y) 17 17 17 17 17 17 17 What is the correlation coefficient for the ...

statistics
Automobile racing, high-performance driving schools, and driver education programs run by automobile clubs continue to grow in popularity. All these activities require the participant to wear a helmet that is certified by the Snell Memorial Foundation, a not-for-profit ...

statistics
These data were generated using the equation y = 2x + 1. A scatter diagram of the data results in five points that fall perfectly on a straight line. x 0 1 2 3 4 y 1 3 5 7 9 (a) Find the correlation coefficient.

Stats
Observations are taken on sales of a certain mountain bike in 30 sporting goods stores. The regression model was Y = total sales (thousands of dollars), X1 = display floor space (square meters), X2 = competitors’ advertising expenditures (thousands of dollars), X3 = ...

stats
Can someone please help me, I have been working on this for 2 hours now and I keep getting a negative answer. You are given the following data. Number of Absences Final Grade 0 99 1 94 2 79 3 73 4 68 5 53 - Find the correlation coefficient for the data. - Find the equation for...

Math
is coefficient of correlation and coefficient of determination the same thing? or different?

Math
is coefficient of correlation and coefficient of determination the same thing? or different?

math/stats
If you square a correlation coefficient and subtract this number from 1.00, what is the result? Is it the coefficient of determination?

statistics
Please Help! My book and instructor are no help. Please help me understand why I need to make a scatter diagram, when dealing with bivariate data, and how to find SS(x), SS(y), SS(xy), and r. I have all the formulas, but don't understand. Thanks! I don't know that the diagram ...

social psy
) Researcher wants to look at the correlation between class attendance and grade in class (higher numbers indicating a higher grade). The researcher found the following result r = .82. The correlation coefficient tells researchers two pieces of information, the strength of the...

statistics
For a given set of data, it is known that x = 10 and y = 4. The gradient of the regression line y on x is 0.6. Find the equation of the regression line and use it to estimate y when x = 8.

Algebra
2. Find the value of x^3 +2x^2 -3 when x =3 Answer-42 12. What type of correlation would you expect between the number of minutes a candle burns and the height of the candle? a. no correlation b. positive correlation c. negative correlation d. equal correlation Answer-c 13. ...

Statistics
Please Help me understand how to work this problem. I have been working on this problem for several days and do not understand what to do. Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs, of people the linear correlation coefficient is 0.922 and...

Statistics
Hi Can anyone tell me in a regression model are the values of 0.13 0.10 A good indication of of the total y explained in a regression model ?? Thanks.

static
The coefficient of correlation between the age and blood pressure of a sample of 8 persons was found to be +0.8, the average age is 50 years and average blood pressure is 60. Their standard deviations were 5 and 10 respectively. a) Obtain the two regression equations b) find ...

Statistic
Number of Absences Final Grade 0 93 1 93 2 77 3 68 4 65 5 54 - Find the correlation coefficient for the data. I got this part of my answer. I believe the answer to be -0.9767 I am just going crazy with the second part. - Find the equation for the regression line for the data, ...

math help pls pls
The correlation coefficient for blood pressure and amount of vegetables eaten in a group of people is −0.7. Analyze the following statement: High blood pressure is caused by not eating vegetables. Is this a reasonable conclusion? No; blood pressure and eating vegetables ...

Correlations
Which type of correlation would you expect to see between the distance traveled and the time it takes to travel that distance? A. positive correlation B. negative correlation C. no correlation idk why this question is confusing me, but it is

algebra
Which type of correlation would you expect to see between the distance traveled and the time it takes to travel that distance? A. positive correlation B. negative correlation C. no correlation idk why this question is confusing me, but it is

statistics for health research
1.A study is conducted to determine the factors that affect the increased maternal mortality rates in Kenya. Establish the variables (at least 5 variables) that you would use to conduct the study. State your expected results and explain how you will apply Correlation and ...

statistics
Calculate the Pearson’s correlation coefficient Assessed value (R’000) Selling price (R’000) 116 185 160 246 144 236 103 162 205 300

Business Statistics
Instructions: Prepare your answers using Excel and show your work to get full or partial credit. Question 1: Using the file Wages.xlsx which contains information of working individuals, for a nationwide firm (Value 7 points). a) Run Descriptive Statistics for the variables ...

statistics
what is the most likely answer for the confidence coefficient of linear correlation if x = the number of hours spent studying for a test, and y = the number of points earned on the test?

Statistics
Which, if any, of the values listed below for a correlation coefficient indicate a situation where more than half of the variation in one variable is associated with variation in the other variable? -.7 1 .3 .6 .9 I was thinking B

algebra 1
*I have asked countless people to help me with this story problem and nobody seems to know how to do it! Please help! Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 ...

statistics
8.Jean Siskel is an entertainment analyst for West Coast Securities. He is trying to develop a model to estimate gross earning generated by a new movie release. He has collected the following data on 20 movies: Gross Earnings, Production Costs, Promotion Costs, and if the ...

statistics
8.Jean Siskel is an entertainment analyst for West Coast Securities. He is trying to develop a model to estimate gross earning generated by a new movie release. He has collected the following data on 20 movies: Gross Earnings, Production Costs, Promotion Costs, and if the ...

statistics
A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class. Test 1 Test 2 92 86 90 87 89 85 82 90 88 79 92 90 100 92 91 84 Is there a significant correlation? Explain its statistical significance, if any.

Psychology Statistics
2 For a sample of n = 20 individuals, how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with  = .05? 3 The Pearson correlation is calculated for a sample of n = 25 individuals. What value of df should be used to ...

Economics
Please correct if I have stated the right correlation to the following relationships: a) volume of auto traffic and auto accident rate -> 0 correlation b) pesticide and crop yield -> negative correlation c) consumption and GDP -> positive correlation

math
I need a definition for this constant rate of change when graphing in mathematics and for Positive and Negative correlation and also what the pattern is in this a) 1000, 100, 10, 1 I'll give you a definition for positive and negative correlation. Correlation is a linear ...

statistics
The data below are the average one-way commute times (in minutes) of selected students during a summer literature class and the number of absences for those students for the term. Calculate the linear correlation coefficient.

Psychology 315
I have ti figure out the correlation coefficient of a statistical factor o 4 personin a dextrity and anxiety test. 1 1 10, 2 1 8, 3 2 4, 4 4 2 . So I have to figure out the correlation coeficient? this is may part of the task.

math help pls pls
The correlation coefficient for poor health and not exercising in a group of people is 0.67. Analyze the following statement: Poor health is caused by not exercising. Is this a reasonable conclusion? Yes; everyone who doesn't exercise is by definition unhealthy Yes; the ...

statistics
1. In an ANOVA, one group has a much larger sample mean than the other. The analyst decides to remove this group and to conduct the analysis on the remaining groups only. Which of the following statements is correct? Select one: a. This analysis is not correct, as now the ...

statistics
True or False: A zero population correlation coefficient between a pair of random variable means that there is no linear relationship between the random variable.

Statistics
Test the significance of the correlation coefficient r at a=0.05 for the data below. X values 59, 65, 73, 80, 89 Y values 97, 102, 110, 117, 125 A) Accept p=0 because 60.81<3.18 B) Reject p=0 because 61.13>3.18 C) Accept p=0 because 61.13<2.78 D) Reject p=0 because 60...

Statistics
1.What is the p value (“significance level”)? What does this p value mean? 2.How does the n (sample size) of this sample affect the r and p values? 3.Is there a relationship between assertiveness and whether one holds anger “in”? Descriptive Statistics Mean Std. ...

stats
(correlation and regression) for y = 25, what is the estimated value of value of x, from the following data: X: 11 12 15 16 18 19 21 y: 21 15 13 12 11 10 9 a) 15 b)7 c)13.588 d) 14.986

Statistics
12.22 A regression was performed using data on 16 randomly selected charities in 2003. The variables were Y = expenses (millions of dollars) and X = revenue (millions of dollars). (a)Write the fitted regression equation. (b)Construct a 95 percent confidence interval for the ...

Statistics
Using the following information find a 95% confidence interval for the intercept in the regression of measured distance on recession velocity. VARIABLE COEFFICIENT STANDARD ERROR Constant 0.3391 0.1185 Velocity 0.001373 0.000227 T-STAT P-VALUE 3.369 0.0028 6.036 0.0000045 Est...

Stats Help!
You are interested in knowing whether wealthier people are happier. You collected data from fifty people about their incomes and their overall happiness levels on a scale of 1 to 10. Upon analyzing the results, you find that the correlation coefficient has a value of −0....

math
Bill is doing a project for you in the marketing department. Ln conducting his analysis regarding consumer behavior and a new product that has come out, he tells you the correlation between these two variables is 1.09. What is your response to this analysis. Judy conducted an ...

Statistics
The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...

Mth plz...help
A linear regression equation of best fit between a student's attendence and the degree of sucess in school is h = 0.5x + 68.5. the correlation coefficent, r, for these data would be (1) 0 < r < 1 (2) -1< r < 0 (3) r = 0 (4) r = -1

Stats
The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. 1. One of the petals is 0.2 cm wider ...

Stats
The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. 1. One of the petals is 0.2 cm wider ...

statistics
What would you guess the value of the correlation coefficient to be for the pair of variables: "number of man-hours worked" and "number of units of work completed"? a) approximately 0.9 b) approximately 0.4 c) approximately 0.0 d) approximately -0.4 e) approximately -0.9

Finance
Security A has an expected return of 7%, a standard deviation of returns of 35%, a correlation coefficient with the market of -0.3, and a beta coefficient of -1.5. Security B has and expected return of 12%, a standard deviation of returns of 10%, a correlation with the market ...

Statistics!!!
b. The correlation between the number correct on a math test and the time it takes to complete the test is -.45. Test whether this correlation is significant for 80 children at the .05 level of significance. Choose either a one-or two-tailed test and justify your choice.

statistics
Consider the following table and use the formulas that are given for computing the correlation coefficient. (Give your answer correct to two decimal places.) x 1 1 0 0 0 y 7 3 5 6 6 r = n xy − x y n x2 − x 2 n y2 − y 2 (1) r = SS(xy) SS(x) · SS(y) (2) r = 1....

Psychology
Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test (high scores mean more anxiety). The scores are as follows. Person Dexterity Anxiety 1 1 10 2 1 8 3 2 4 4 4 -2 (c) figure the correlation coefficient; (d) figure ...

algebra 1
LaTasha was presented with the following data set and argued that there was no correlation between x and y. Is LaTasha correct? Use the regression equation to explain your reasoning.

Statistics
c) There is a correlation between students’ levels of anxiety and the number of days they are absent from school (r = 0.53, p = 0.31). Interpret if this result was statistically significant and explain why or why not. My answer is this: The analysis gives us a correlation ...

statistics
Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation is -0.42. a)Is there evidence of a significant correlation between number of ...

Statistics
foofy computes the correlation between an individual's physical strength and his or her college grade poing average. Using a computer, the correlation for a sample of 2000 people is r(1998)=+.08, p=<.0001. she claims this is a useful tool for predicting which college ...

Statistics
Simple Linear Regression Analysis 2. Weight of Car: Miles gallon – Do heavier cars really use more gasoline? The following data were obtained from Consumer Reports (Vol 62 no. 4). Weight of car is in hundreds of pounds. Car Weight 27 44 32 47 23 40 34 52 MPG 30 19 24 13 29 ...

math
interpret an r value of -0.82. a)strong negative correlation B)weak negative correlation C)strong positive correlation D)no correlation

STATISTICS
The following data represents the monthly natural gas consumption (in hundreds of cubic feet) for a family for a random sample of nine months selected from five years of data. The other variable is Degree-days which is a measure of temperature. Degree-days are the number of ...

multiple regression
5. HR Assistant Survey A sample of HR assistants in Plano Texas was created. It was suggested that the data should be analyzed with a regression model to determine if salary was related to years of experience, aptitude test scores, EI (emotional intelligence)scores, number of ...

Statistics
In Professor White’s statistics course the correlation between the students’ total scores before the final examination and their final examination scores is r = 0.9. The pre-exam totals for all students in the course have mean 275 and standard deviation 50. The final exam ...

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>

Post a New Question